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Finding the Fourth Proportional to 278.79, 418.10 and 105.42

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Solution

The fourth proportional to 278.79, 418.10 and 105.42 is: 158.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.79 : 418.10 = 105.42 : x
  2. Step 2: Convert to fraction form
    278.79/418.10 = 105.42/x
  3. Step 3: Cross multiply
    278.79x = 418.10 × 105.42
  4. Step 4: Simplify right side
    278.79x = 44,074.79
  5. Step 5: Solve for x
    x = 44,074.79/278.79
  6. Step 6: Final answer
    x = 158.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.